1) hỗn hợp hai đồng vị có ngtu khối tb là 10,821 số n hơn kém nhau là 1 đồng vị có số khối lớn chiếm 81,2 % xđ số khối của mỗi đồng vị 2 )NTK trung bình của H là 1,088 bit H có hai đồng vị chũ yếu là 1H và 2H 1 1

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1. He often played the piano at night. → He used to ___________________________________________ 2. It's a pity he can't come to the party. → I wish ________________________________________________ 3. She will sell her house next week. → We wish _____________________________________________ 4. Mary often stays at home on Sundays. → Mary is used to ______________________________________ 5. He won't come here again. → I wish ________________________________________________ 6. Today is not Sunday. → We wish _____________________________________________ 7. Maryam usually plays the piano at night. → Maryam is used to __________________________________ 8. I'm sorry, I must go now. → I wish _______________________________________________ 9. I miss the cartoon on TV. → I wish _______________________________________________ 10. Lan cannot meet her friends. → Lan wishes _________________________________________ 11. They don't know how to speak Chinese. → They wish __________________________________________ 12. Phong cannot win the champion. → Phong wishes ______________________________________ 13. Ha doesn't get a chance to meet that famous singer. → Ha wishes __________________________________________ 14. Henry walked to school. → Henry used to ______________________________________ 15. They wore uniforms at school. → They used to _______________________________________ 16. They don't usually drink beer. → They are not used __________________________________ 17. She always swam when she was 15. → She used ___________________________________________ 18. I don't have time to go around the city. → I wish _______________________________________________ 19. We don't have a computer; therefore, we cannot get access to the Internet. → We wish ____________________________________________ 20. She doesn't send me her recent photos. → I wish _______________________________________________ 21. My friend doesn't have money to repair his bicycle. → I wish _______________________________________________ 22. My students don't speak English fluently. → I wish _______________________________________________